Unit 1 Life Choices Section 4 Focus on Language：Infinitives（Word教参）-【新课程学案】新教材2023-2024学年高中英语必修第一册（北师大版2019）

11 / 151 Section 4　 Focus on Language：Infinitives 课时目标 1.辨析句子中的谓语动词与非谓语动词。 2.分析并识别非谓语动词在句子中充当的成分。 3.能正确识别动词不定式在句中的成分并准确使用。 初识语法——在美文运用中体悟 Are you looking for a sports watch to help you keep track of your fitness and chart your training progress① ? To wear a DX Sports Watch② is an ideal choice for you, whether you're a professional athlete or keen sportsperson. It has a digital display to record your steps, speed and distance③ , as well as monitor your heart rate and calories burnt. It also has a voice control setting to enable you④to stay hands-free⑤， while its waterproof band is fully adjustable so that it is comfortable to wear⑥. DX Sports Watch is only available online, so go to our website and place your order today！,句①动词不定式to help you keep ...作后置定语，修饰a sports watch。 句②动词不定式To wear ...作主语。 句③动词不定式to record your steps ...作后置定语，修饰a digital display。 句④动词不定式to enable ...作后置定语，修饰 a voice control setting。 句⑤动词不定式to stay hands-free作宾语补足语。 句⑥动词不定式 to wear作状语。 慧学语法——运用“形式—意义—使用”三维动态语法观　 动词不定式是非谓语动词的一种，它没有人称和数的变化。动词不定式具有名词、形容词和副词的特征，在句中可以作主语、宾语、表语、定语、状语、宾语补足语等，但不能作谓语。其基本结构：to＋动词原形，有时不定式符号to可以省略。其进行时为to be doing，完成时为to have done。 一、不定式作主语、表语和宾语　 [先感知] ①(教材典句)It's so convenient to be able to compare the quality and prices from different online shops before I buy. ②(教材典句)My aim is to do well in every subject this term. ③(教材典句)All in all, I hope to have a happier, more fruitful and satisfying life in my new school. ④To do this is to cut the foot to fit the shoe. ⑤I think it very necessary to protect the animals. ⑥(教材典句)．.. my target is to prepare myself for my degree in biology at university. [会发现] 上述几个例句，其中①④句是不定式短语作主语，②⑥句是不定式短语作表语，③⑤句是不定式短语作宾语。 [明规则] 1．动词不定式作主语 (1)动词不定式作主语时，在很多情况下都可以用动词-ing 替代，但表示某些具体情况，或表示较强烈的对比，或在某些固定说法中时，通常不用动词-ing替代。 (2)动词不定式作主语，谓语动词用单数形式。 (3)若不定式太长，则往往用it代替不定式作形式主语，不定式移至谓语之后，以使句子结构平衡。 2．动词不定式作宾语 (1)有些动词后常跟不定式(而不跟动名词)作宾语，如： decide, afford, agree, attempt, choose, determine, demand, expect, fail, hope, manage, offer, plan, prepare, pretend, promise,